Explanations for the lower rates of diabetic neuropathy in Indian Asians versus Europeans
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1 Diabetes Care Publish Ahead of Print, published online March 9, 2010 Ethnic differences in diabetic neuropathy Explanations for the lower rates of diabetic neuropathy in Indian Asians versus Europeans Short running title: Ethnic differences in diabetic neuropathy Caroline A. Abbott 1, PhD, Nishi Chaturvedi 2, MD, Rayaz A. Malik 1, PhD, Eleanna Salgami 1, MD, Allen P.Yates 3, PhD, Philip W. Pemberton 3, PhD, Andrew J.M. Boulton 1, MD 1 Cardiovascular Research Group, School of Biomedicine, University of Manchester, Manchester 2 International Centre for Circulatory Health, National Heart & Lung Institute, Imperial College at St. Mary s, London 3 Department of Clinical Biochemistry, Manchester Royal Infirmary, Manchester. Address for correspondence: Dr. Caroline Abbott caroline.abbott@manchester.ac.uk Submitted 9 November 2010 and accepted 26 February This is an uncopyedited electronic version of an article accepted for publication in Diabetes Care. The American Diabetes Association, publisher of Diabetes Care, is not responsible for any errors or omissions in this version of the manuscript or any version derived from it by third parties. The definitive publisherauthenticated version will be available in a future issue of Diabetes Care in print and online at Copyright American Diabetes Association, Inc., 2010
2 Objective: Risks of diabetes and cardiovascular disease are elevated worldwide in Indian Asians. However, risks of other diabetes-related complications, i.e. foot ulceration and amputation, also with a vascular basis, are substantially lower in Asians than White Europeans in the UK, possibly due to less neuropathy. We therefore compared signs, symptoms and objective quantitative measures of diabetic neuropathy, and their risk factors, in Indian Asians and Europeans. Research Design and Methods: This was a cross-sectional study of a population-based sample of age- and sex-matched adults with type 2 diabetes of European (95 male: 85 female) and Asian (96 male: 84 female) descent in the UK. Patients were assessed for neuropathic symptoms, signs, nerve conduction, autonomic function and quantitative sensory testing. Peripheral vascular function and other potential risk factors for neuropathy were measured. Results: Mean nerve conduction velocity Z-scores were better in Asians ( ; mean+sd) than Europeans ( ; p=0 007) and were explained by the shorter height, fewer packyears smoked and higher transcutaneous oxygen levels (TCpO 2 ) in Indian Asians (p value for ethnic comparison attenuated to 0 2). Small fibre neuropathy was less prevalent in Indian Asians compared to Europeans (odds ratio 0.58 (95% CI ) p=0.02) and was primarily accounted for by better TCpO 2 (0.70 ( ) p=0.2). Conclusions: Asians with diabetes have substantially less large and small fibre neuropathy than Europeans, despite comparable traditional risk factors. Independent from smoking, the lower risk of neuropathy in Asians is due to better skin microvascularisation and may help explain the substantially reduced Asian foot ulcer risk. 2
3 People of Indian Asian descent worldwide have one of the highest risks of type 2 diabetes; in the UK this is four times more prevalent than the general population (1). Most studies indicate that risks of cardiovascular disease (CVD) in Indian Asians with diabetes are greater than that in Europeans, reflecting their overall greater predisposition to CVD (2,3). Although many diabetes complications have a vascular basis, we and others have shown, paradoxically, that risks of both foot ulceration and amputation are substantially lower (3-fold and 4-fold, respectively) in Indian Asians compared to Europeans (4,5), and that lower rates of peripheral neuropathy in Indian Asians may, to a large extent, account for this protection. To date, however, neuropathy assessments have been crude, subjective, and not comprehensive, and explanations for ethnic differences not sought. This study was designed to compare and account for differences in neuropathy between Indian Asians and Europeans with type 2 diabetes. We hypothesized that Indian Asians would have preserved large and small nerve function, using objective criteria, compared to Europeans, and that this would only be partly explained by differences in conventional risk factors. RESEARCH DESIGN AND METHODS Patients and study design: This was a cross-sectional study of a randomly selected population-based sample of people with type 2 diabetes of European and Indian Asian descent drawn from primary care registers in Manchester, UK. Type 2 diabetes was defined as a diagnosis made between years of age without insulin until at least 2 years after diagnosis, or a diagnosis at age 40 years and above regardless of initial treatment. As mean age of diabetes diagnosis is generally younger in Indian Asians compared to Europeans, broadening inclusion criteria for these individuals reduced the risk of a biased sample (5). A 5 year age stratum, ethnicity and gender matched sample of Indian Asians and Europeans with known type 2 diabetes was drawn from 8 primary care registers in Central Manchester, all of whom participate in ethnicity monitoring. Exclusion criteria were lower limb amputation, psychiatric disorder, known HIV positive or Hepatitis carrier, terminal illness or inability to understand the study or sign informed consent. We required 360 people with diabetes (180 from each ethnic group). To achieve this, a total sample of 682 eligible patients was selected for invitation (52% Indian Asian, 51% male, mean age SD). Of this sample, 360 subjects (53% response rate) gave written consent to participate (50% Indian Asian, 47% male, mean age 58+10). Differences between responders and non-responders for age, sex and ethnicity were not significant. This study was approved by North Manchester Research Ethics Committee and by the University of Manchester Committee on the Ethics of Research on Human Beings. Assessments: Consenting participants attended fasting at the Manchester Royal Infirmary. A questionnaire was completed obtaining demographic data, medical history including drugs, and lifestyle factors. Ethnicity was checked and country of birth recorded (all Indian Asian participants were first generation migrants). Trained personnel performed all measurements with standardized procedures and equipment according to existing protocols. We measured height, weight, waist and hip circumference by a single measurement. Fasting blood samples were taken and sent to central laboratories for measurement of A1C, fasting plasma glucose, total cholesterol, HDL cholesterol, triglycerides and serum gamma glutamyltransferase 3
4 (marker of alcohol consumption). Fasting serum insulin was measured using a sensitive in-house radioimmunoassay as described previously (6). Clinical complications of diabetes: Retinopathy and nephropathy were defined as a history of physician-diagnosed disease. Serum and early morning urinary creatinine were measured on a Roche MODULAR P Unit using the Jaffe method. Urinary albumin was measured on a Beckman Array analyser using their nephelometric assay. Urinary albumin/creatinine ratio was calculated. CVD was defined as either a physician-diagnosed myocardial infarction, angina, coronary-artery bypass graft or stroke, or a positive response to the Rose Angina Questionnaire (7). Peripheral arterial disease was defined as previous history of physician-diagnosed claudication confirmed by lower limb arteriogram, or a positive response to the Edinburgh Claudication Questionnaire (8). Assessment and definition of neuropathy 1) Clinical symptoms and signs of neuropathy: Symptoms of muscle weakness, sensation and autonomic neuropathy were determined from the Neuropathy Symptoms and Change (NSC) validated questionnaire (9). Signs were assessed using the modified Neuropathy Disability Score (NDS), comprising pin-prick, vibration, temperature sensation, and ankle reflexes. An NDS of >6 indicated clinical neuropathy (10). 2) Large fibre neuropathy: Electrophysiological assessments of peroneal, tibial and ulnar nerves (motor nerve conduction velocity (NCV), maximum M- wave amplitude) and sural and radial nerves (NCV and amplitude) were performed using a Dantec Counterpoint EMG system with surface electrodes (skin temperature >32 C). These assessments provide multiple, similar, markers of peripheral nerve function therefore we constructed Z-scores. For each individual, every NCV value was expressed as a Z-score, i.e. (value in the individual minus mean value in the overall study population) divided by the standard deviation. Average NCV Z-score was calculated as ((Z-score sural NCV)+(Zscore peroneal below fibular head [BFH] NCV)+(Z-score peroneal knee NCV)+(Zscore tibial NCV)+(Z-score radial NCV)+(Zscore ulnar NCV)) / 6. Thus, the more positive the result, the better the nerve function. Response amplitude Z-score was similarly calculated. VPT was assessed at the right and left great toes in duplicate using a calibrated Neurothesiometer (Horwell, Scientific Laboratory Supplies, Nottingham, UK) (11). Readings were averaged for analyses. 3) Small fibre neuropathy: Cooling detection thresholds (CDT), heat pain minimal threshold (HP-VAS0.5) and heat pain intermediate threshold (HP-VAS5.0) were evaluated on the dorsum of the left foot using a CASE IV system (WR Medical Electronics, Stillwater, MN, USA) (12). For thermal thresholds >95 th percentile of the CASE IV normality range was considered abnormal. Autonomic function was assessed by: a) change in resting heart rate in response to 2 separate cycles of deep breathing (HRDB) using a CASE IV system (<5 th percentile of the CASE IV normality range was considered abnormal) (12); b) change in systolic blood pressure from lying position to standing, using a Critikon Dinamap 8100T plus adult Dura-cuff. Algorithm for small fibre neuropathy: Small fibre neuropathy was classified using an algorithm incorporating the CASE IV normality range for HRDB, CDT, HP-VAS0 5 and HP-VAS5 0 (12). Severity of small fibre dysfunction was stratified as: normal (all tests normal), mild (one abnormal test), moderate (two abnormal tests) and severe (> 3 abnormal tests). Small 2
5 fibre neuropathy was defined as presence of mild, moderate or severe dysfunction. Vascular function tests: Anklebrachial pressure index (ABPI) was determined using a Multi Dopplex II ultrasound machine (Huntleigh Diagnostics) and sphygmomanometer (Speidel & Keller). Duplicate blood pressure readings were averaged for each limb and ABPI averaged for right and left side combined. Abnormal ABPI was defined as <0 85 (13). Transcutaneous partial pressure of oxygen (TCpO 2 ) was determined on the left foot dorsal surface using a Transcutaneous Monitor and oxygen sensor (Novametrix Medical Systems Inc., CT, USA) (14). The patient was semi-recumbent and foot skin temperature maintained at >32 C. The calibrated, TCpO 2 sensor heated and maintained skin temperature at 44 C. This produced a local maximal vasodilation to increase the permeability of the skin to oxygen. Measurements were taken after 20 minutes of stabilisation. Statistical Analysis: Nerve conduction velocity (NCV) was selected as the primary outcome of interest, as it is an early marker of disease and measured objectively. We estimated that 360 patients (180 in each ethnic group) would be sufficient, with 85% power to detect a difference in NCV of at least one-third of a standard deviation, at the 5% significance level, making allowances for missing data. Measures of neuropathy were compared between the ethnic groups as continuous variables, using simple means. Normally distributed data were tested using Student s t-test; non-normally distributed data were log transformed before analysis or the Mann-Whitney test was used. Multivariate linear regression models using analysis of variance were constructed to explore the role of potential confounders including glycaemic control, height, smoking and hypertension and determine which factors could account for any ethnic differences in measures of neuropathy. Categorical variables were compared as simple proportions in the first instance, using the chi-squared test for significance. Logistic regression models were constructed to calculate odds ratios and adjust for important confounders. Interactions with ethnicity were also tested. RESULTS We studied 360 type 2 diabetic patients (table 1). Indian Asians (n=180) comprised 116 subjects originating from Pakistan (64 4%), 26 from India (14 4%), 31 from Bangladesh (17 2%) and 7 subjects classified as Indian Asian-Other (3 9%). The White European group (n=180) comprised 157 subjects who were White British (87 2%), 17 who were White Irish (9 4%) with the remainder (n=6) being White-Other (3 3%). Duration of diabetes was shorter in Europeans than in Indian Asians (p<0 01). Europeans were taller with a higher body mass index (p<0 05), greater smoking prevalence and higher alcohol intake (p<0 001). Significantly more Indian Asians were treated with oral hypoglycaemic agents (p<0 001), whereas they were much less likely to be taking lipid lowering (p<0 01) or antihypertensive therapies (p<0 001). Clinical signs and symptoms of neuropathy: Neuropathy signs (NDS>6) were more prevalent in Europeans (36/180 (20%)) than Indian Asians (27/178 (15%)), though this was not statistically significant (p=0 2) (figure 1a). Overall symptom reporting did not differ by ethnicity (total mean NSC score for Europeans: ; Indian Asians: , p=0 9), however Europeans reported greater loss of peripheral sensation ( vs , p=0.018). Large nerve fibre function: Indian Asians had higher mean values for all motor and sensory NCVs and amplitudes than Europeans (NCV and response amplitude Z- scores ; (mean+sd) in 3
6 Indian Asians, (p=0 007); (p=0 003) in Europeans (figure 1b). VPT did not differ by ethnicity. Small nerve fibre function: Cool detection threshold (Indian Asians: ; Europeans ; p=0 2) or heat pain threshold (Indian Asians: ; Europeans: , p=0 4) did not differ by ethnicity. HRDB was greater in Indian Asians ( beats/min) vs. Europeans ( ; p=0 002) (figure 1c), whereas postural fall in systolic blood pressure did not differ. Overall prevalence of small fibre neuropathy was significantly lower in Indian Asians (32%) than Europeans (43%; p=0 03) (figure 1a). Ethnic differences in vascular function: Peripheral vascular function was more favourable in Indian Asians than Europeans, i.e. Indian Asians were less likely to report claudication or have an abnormal ABPI, and had higher TCpO 2 levels (table 1). Adjustment for ethnic differences in smoking status, height, lipid levels, A1C or ABPI had no impact on the ethnic difference in TCpO 2 levels (data not shown). Explanations for ethnic differences in large nerve fibre function: Smoking had little impact in accounting for the ethnic difference in peripheral nerve large fibre function (NCV Z-scores) (table 2). Height appeared to have the greatest single impact, with a multivariate model, including height, pack-years smoked and TCpO 2 substantially attenuating the ethnic difference in nerve function, losing statistical significance (p=0 2). An analysis restricted to never smokers showed that Indian Asians maintained greater NCV Z-scores than their European counterparts (0 13 [0 025, 0 24] vs [-0 23, 0 10], p=0 05. Explanations for ethnic differences in small fibre neuropathy: The risks (odds ratio) of small fibre neuropathy was 0 61 (p=0 03) in Indian Asians versus Europeans (table 3). Adjustment for the lower smoking rates and shorter height in Indian Asians did not appreciably alter this ethnic difference in risk, but some attenuation was observed when adjusted for ABPI and for TCpO 2. A multivariate model with all these factors attenuated the odds ratio to 0 70 (p=0 2). The impact of ABPI (p=0 02) and TCpO 2 (p=0 02) in this multivariate model were statistically significant and independent of each other. As a sensitivity analysis, we also compared small fibre neuropathy in never smokers, and the ethnic difference persisted (n=178): 31% in Indian Asians and 52% in Europeans, p= Only BMI appreciably accounted for the ethnic difference in autonomic small fibre function, i.e. HRDB (10 4 versus 9 1 beats/min, p=0 08, in Indian Asians versus Europeans; table 3); height alone had negligible impact. CONCLUSIONS We show, using objective measurements, that both somatic and autonomic nerve function is better preserved in Indian Asians compared to Europeans with diabetes. Healthier peripheral vascular function was the key modifiable determinant of this protection from neuropathy in Indian Asians with independent contributions from low smoking rates and shorter height. Whilst others have reported favourable levels of neuropathy in Indian Asians, this largely relied on subjective, crude measures of advanced neuropathy, and explanations for ethnic differences were not explored (4,5,15). Indian Asians with newly diagnosed diabetes in the UK Prospective Diabetes Study had lower rates of neuropathy than Europeans (4% compared with 13%) diagnosed using vibration sensation threshold (15). However, individuals with pre-existing CVD were excluded, and, as this is more common in Indian Asians, may have biased the comparison. In our previous large, population-based studies, we also showed that prevalence of neuropathy was significantly 4
7 lower in Indian Asians compared with Europeans with diabetes (4,5), but again objective measures were not used. Varying rates of peripheral neuropathy from the Indian sub-continent have been reported (3%-25%) (16,17), but as assessment methods vary it is difficult to compare these rates directly with European samples. Height is often cited as a key risk factor for neuropathy; it is therefore unsurprising that shorter height in Indian Asians contributes to their lower risk (18). The additional significant contributions from lower smoking rates plus favourable peripheral blood flow indicators (TCpO 2, ABPI) support the vascular theory for neuropathy aetiology (19). Others report that both macrovascular (systolic blood pressure, conduit arterial stiffening and thickness) (20) and microvascular (reduced capillary blood flow due to endothelium-dependent and independent mechanisms) (21) abnormalities are key determinants of nerve fibre function in type 2 diabetes. These abnormalities are strongly correlated in individuals and populations. However, we show that despite the anticipated greater macrovascular burden, Indian Asians have substantially better TCpO 2 (not wholly explained by lower smoking rates), and it is this that contributes to the favourable neuropathy status. TCpO 2, or tissue oxygenation, in the lower limb is an indicator of upstream blood flow and can be affected by large vessel occlusion, arteriole and/or capillary function (22). In addition, we show that peripheral arterial disease, as measured by ABPI, is lower in Indian Asians and makes a significant and independent contribution to account for ethnic differences in peripheral neuropathy, comparable to TCpO 2. Our TCpO 2 data, therefore, more likely reflects micro (capillary and arteriole) function than large vessel flow. These findings suggest that microvascular flow may explain ethnic differences in neuropathy aetiology. The reasons why Asians have better microvascular function, despite poorer macrovascular function is, as yet, unclear. Elsewhere, glycaemia, triglycerides and insulin resistance have been linked with clinical polyneuropathy in type 2 diabetes (23,24). However, we found these factors had little effect on accounting for ethnic differences and were overwhelmed by the impact of tissue oxygenation, probably indicating that this is a better downstream measure of the composite of vascular insults. The marked ethnic differences in objective nerve electrophysiological measures were largely not reflected in reported neuropathic symptoms or elicited signs. This may reflect the greater sensitivity of electrophysiology, detecting very early signs of disease, and the subjectivity of signs and symptoms. This latter is particularly important in ethnic comparison studies, where interpretation and reporting may differ. Our findings underline the importance of objective assessments. Our study is large and representative of the general population with diabetes, as sampling was from primary rather than hospital care, the former having universal coverage. In addition, as healthcare is free at the point of delivery, differences in access to healthcare should not have influenced our findings. One limitation of this study is that it is cross-sectional, whereas a longitudinal assessment of neuropathy development would substantiate our findings. A possible explanation for the lower prevalence of neuropathy observed in Indian Asians is that the elevated risk of premature cardiovascular death had selected out Indian Asians with current or high risk of subsequent neuropathy. However, selective mortality cannot be the full explanation as we estimate that premature CVD mortality would have to be 3-4 fold greater, rather than the observed 1 5 to 2 fold increase in younger Indian Asians than Europeans, to account for the lower neuropathy prevalence detected in our study. 5
8 We therefore conclude that both peripheral and autonomic neuropathy is less prevalent in Indian Asians than Europeans with type 2 diabetes. Furthermore, lower height, less smoking and a more favourable microcirculation, rather than conventional risk factors such as glycaemic control and hyperlipidemia, appear to account independently for the Indian Asian preservation of peripheral nerve function. These data may explain why Indian Asians are protected against diabetic foot ulceration, as sensitivity to trauma via peripheral large fibre function and autonomic neurogenic control of cutaneous blood flow are primary factors in the risk of plantar tissue breakdown and delayed wound healing (4,25). ACKNOWLEDGEMENTS This study was supported by Diabetes UK. None of the authors have any conflict of interest to disclose. 6
9 REFERENCES 1. McKeigue PM, Shah B, Marmot MG: Relation of central obesity and insulin resistance with high diabetes prevalence and cardiovascular risk in South Asians. Lancet 337: , Forouhi NG, Sattar N, Tillin T, McKeigue PM, Chaturvedi N: Do known risk factors explain the higher coronary heart disease mortality in South Asian compared with European men? Prospective follow-up of the Southall and Brent studies, UK. Diabetologia 49: , Ethnicity and cardiovascular disease. The incidence of myocardial infarction in white, South Asian, and Afro-Caribbean patients with type 2 diabetes (U.K. Prospective Diabetes Study 32). Diabetes Care 21: , Abbott CA, Garrow AP, Carrington AL, Morris J, Van Ross ER, Boulton AJ: Foot ulcer risk is lower in South-Asian and african-caribbean compared with European diabetic patients in the U.K.: the North-West diabetes foot care study. Diabetes Care 28: , Chaturvedi N, Abbott CA, Whalley A, Widdows P, Leggetter SY, Boulton AJ: Risk of diabetes-related amputation in South Asians vs. Europeans in the UK. Diabet Med 19:99-104, Yates AP, Laing I: Age-related increase in haemoglobin A1c and fasting plasma glucose is accompanied by a decrease in beta cell function without change in insulin sensitivity: evidence from a cross-sectional study of hospital personnel. Diabet Med 19: , Rose GA: The diagnosis of ischaemic heart pain and intermittent claudication in field surveys. Bull World Health Organ 27: , Leng GC, Fowkes FG: The Edinburgh Claudication Questionnaire: an improved version of the WHO/Rose Questionnaire for use in epidemiological surveys. J Clin Epidemiol 45: , Apfel SC, Asbury AK, Bril V, Burns TM, Campbell JN, Chalk CH, Dyck PJ, Feldman EL, Fields HL, Grant IA, Griffin JW, Klein CJ, Lindblom U, Litchy WJ, Low PA, Melanson M, Mendell JR, Merren MD, O'Brien PC, Rendell M, Rizza RA, Service FJ, Thomas PK, Walk D, Wang AK, Wessel K, Windebank AJ, Ziegler D, Zochodne DW: Positive neuropathic sensory symptoms as endpoints in diabetic neuropathy trials. J Neurol Sci 189:3-5, Abbott CA, Carrington AL, Ashe H, Bath S, Every LC, Griffiths J, Hann AW, Hussein A, Jackson N, Johnson KE, Ryder CH, Torkington R, Van Ross ER, Whalley AM, Widdows P, Williamson S, Boulton AJ: The North-West Diabetes Foot Care Study: incidence of, and risk factors for, new diabetic foot ulceration in a community-based patient cohort. Diabet Med 19: , Young MJ, Every N, Boulton AJ: A comparison of the neurothesiometer and biothesiometer for measuring vibration perception in diabetic patients. Diabetes Res Clin Pract 20: , Quattrini C, Tavakoli M, Jeziorska M, Kallinikos P, Tesfaye S, Finnigan J, Marshall A, Boulton AJ, Efron N, Malik RA: Surrogate markers of small fiber damage in human diabetic neuropathy. Diabetes 56: , Weatherley BD, Nelson JJ, Heiss G, Chambless LE, Sharrett AR, Nieto FJ, Folsom AR, Rosamond WD: The association of the ankle-brachial index with incident coronary heart disease: the Atherosclerosis Risk In Communities (ARIC) study, BMC Cardiovasc Disord 7:3,
10 14. Kalani M, Brismar K, Fagrell B, Ostergren J, Jörneskog G: Transcutaneous oxygen tension and toe blood pressure as predictors for outcome of diabetic foot ulcers. Diabetes Care 22: , UKPDS: UK Prospective Diabetes Study. XII: Differences between Asian, Afro- Caribbean and white Caucasian type 2 diabetic patients at diagnosis of diabetes. UK Prospective Diabetes Study Group. Diabet Med 11: , Ramachandran A, Snehalatha C, Sasikala R, Satyavani K, Vijay V: Vascular complications in young Asian Indian patients with type 1 diabetes mellitus. Diabetes Res Clin Pract 48:51-56, Weerasuriya N, Siribaddana S, Dissanayake A, Subasinghe Z, Wariyapola D, Fernando DJ: Long-term complications in newly diagnosed Sri Lankan patients with type 2 diabetes mellitus. QJM 91: , Tesfaye S, Stevens LK, Stephenson JM, Fuller JH, Plater M, Ionescu Tirgoviste C, Nuber A, Pozza G, Ward JD: Prevalence of diabetic peripheral neuropathy and its relation to glycaemic control and potential risk factors: the EURODIAB IDDM Complications Study. Diabetologia 39: , Tesfaye S, Malik R, Ward JD: Vascular factors in diabetic neuropathy. Diabetologia 37: , Yokoyama H, Yokota Y, Tada J, Kanno S: Diabetic neuropathy is closely associated with arterial stiffening and thickness in Type 2 diabetes. Diabet Med 24: , Morris SJ, Shore AC, Tooke JE: Responses of the skin microcirculation to acetylcholine and sodium nitroprusside in patients with NIDDM. Diabetologia 38: , Krishnan STM, Rayman G: Microcirculation and Diabetic Foot. In The Foot in Diabetes, Fourth ed. Boulton AJM, Cavanagh PR, Rayman G, Eds. Chichester, John Wiley & Sons Ltd., 2006, p Van De Poll-Franse LV, Valk GD, Renders CM, Heine RJ, Van Eijk JT: Longitudinal assessment of the development of diabetic polyneuropathy and associated risk factors. Diabet Med 19: , Wiggin TD, Sullivan KA, Pop-Busui R, Amato A, Sima AA, Feldman EL: Elevated triglycerides correlate with progression of diabetic neuropathy. Diabetes 58: , Fromy B, Abraham P, Bouvet C, Bouhanick B, Fressinaud P, Saumet JL: Early decrease of skin blood flow in response to locally applied pressure in diabetic subjects. Diabetes 51: ,
11 Table 1: Demographic and clinical characteristics of ethnic groups Values are either percentage prevalence, mean +SD or geometric mean [25 th, 75 th percentiles]. Indian Asians (n = 180) White Europeans (n = 180) Male : Female (n) 95 : : Age (years) Duration diabetes (years) Height (m) < Weight (kg) < Body Mass Index (kg/m 2 ) < Waist (cm) males; females ; ; <0 0001; 0 01 Hips (cm) males; females ; ; <0 0001;< Waist/hip ratio males; females ; ; <0 0001; 0 2 Fasting plasma glucose (mmol/l) A1C (%) Total cholesterol (mmol/l) HDL-cholesterol (mmol/l) Fasting triglycerides (mmol/l) 1 4 (1 1, 1 9) 1 7 (1 2, 2 4) Insulin (mu/l) 17 1 (9 6, 27.1) 18 2 (11 5, 28 6) 0 44 Gamma glutamyltransferase (U/L) < Creatinine (μmol/l) Urinary albumin/creatinine ratio 1 5 (0 7, 2 5) 1 4 (0.6, 3 0) 0 6 Retinopathy (%) Nephropathy (%) Hypertension (%) MI (%) Angina (%) CABG (%) Resting heart rate (b/min) Ankle systolic BP (mmhg) Brachial systolic BP (mmhg) ABPI < 0 85 (%) Lower limb vascular intervention (%) Claudication (%) TCpO 2 (mm Hg) < Pack Years-smoked (%): None; <20; >20 75; 14; 11 36; 22; 42 < Drink alcohol > once a week (%) 5 42 < Insulin (%) Oral antidiabetic drugs (%) Anti-hypertensives (%) Lipid lowering drugs (%) Other CHD drugs (%) * P value for ethnic difference P * 4
12 Table 2: Large nerve fibre function (mean NCV Z-score for sural, peroneal, tibial, radial and ulnar nerves combined) with 95% confidence intervals, by ethnicity Adjustment factors Indian Asian European P * Unadjusted 0.07 [-0.02, 0.16] [-0.20, -0.02] Age + diabetes duration 0.09 [0.002, 0.18] [-0.22, -0.04] Age + duration + height 0.04 [-0.04, 0.12] [-0.16, 0.01] 0.06 Age + duration + pack-yrs smoked 0.07 [-0.03, 0.16] [-0.20, -0.01] 0.01 Age + duration + TCpO [0.02, 0.20] [-0.18, 0.001] Age + duration + height + pack-yrs smoked + TCpO [-0.04, 0.14] [-0.12, 0.06] 0.2 * P value for ethnic difference NCV: nerve conduction velocity; TCpO 2 : transcutaneous oxygen levels Table 3: Regression modeling - small fibre neuropathy by ethnicity: Risk (odds ratio) of small fibre neuropathy in Indian Asians vs. Europeans with adjustment for co-variates Adjustment factors Odds Ratio (95% CI) P * Unadjusted 0 61 ( ) 0 03 Age + diabetes duration 0 58 ( ) 0 02 Age + duration + pack-years smoked 0 58 ( ) 0 04 Age + duration + pack-years smoked + height 0 61 ( ) 0 06 Age + duration + pack-years smoked + ABPI< ( ) 0 09 Age + duration + pack-years smoked + TCpO ( ) 0 09 Multivariate Model: Age + duration + pack-years smoked + height + ABPI< TCpO ( ) 0 2 Autonomic nerve function (heart rate decline in response to deep breathing, beats/minute) with 95% confidence intervals, by ethnicity Adjustment factors Indian Asian European P* Unadjusted 10 8 [9 8, 11 8] 8 5 [7 5, 9 5] Age + diabetes duration 10 8 [9 8, 11 7] 8 7 [7 8, 9 6] Age + duration + height 10 9 [9 9, 11 8] 8 6 [7 7, 9 6] Age + duration + weight 10 4 [9 4,11 4] 9 0 [8 0, 10 0] 0 07 Age + duration + BMI 10 4 [9 4, 11 3] 9 1 [8 1, 10 0] 0 08 * P value for ethnic difference TCpO 2 : transcutaneous oxygen levels; ABPI: ankle brachial pressure index; BMI: body mass index. Figure legends Figure 1: Indices of neuropathy by ethnicity: (a) Neuropathy prevalence (%); (b) Nerve Conduction Studies (Z-scores) (mean ± SE); (c) Autonomic nerve function (mean ±SD). Indian Asians, Europeans * significantly different between the 2 groups p<0 05 ** significantly different between the 2 groups p<0 01 NDS: neuropathy disability score; NCV: nerve conduction velocity; SBP: systolic blood pressure 5
13 Figure 1 6
14 7 Ethnic differences in diabetic neuropathy
Diabetes Care 33: , 2010
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